CN215645663U - Low-noise outdoor high-low voltage prefabricated box type transformer substation - Google Patents

Abstract

The utility model discloses a low-noise outdoor high-low voltage prefabricated box-type substation in the technical field of box-type substations, which comprises a box-type substation body, wherein a sound-insulating and sound-absorbing cotton layer is arranged on the side wall of an inner cavity of the box-type substation body, a low-pressure chamber is arranged on the left side of the inner cavity of the sound-insulating and sound-absorbing cotton layer, a high-pressure chamber is arranged on the right side of the inner cavity of the sound-insulating and sound-absorbing cotton layer, a substation chamber is arranged between the low-pressure chamber and the high-pressure chamber through a partition plate, through holes are formed in the side walls of two groups of partition plates, axial flow fans are arranged on the left side and the right side of the top of the front side wall of the box-type substation body, the output ends of the axial flow fans are fixedly connected with air ducts, an air inlet is fixedly connected to the two groups of air ducts after the two groups of air ducts penetrate through the top of the box-type substation body, a filter screen is arranged on the left side of the inner cavity of the air inlet, and can rapidly dissipate heat and cool the box-type substation body, the radiating effect of the box-type substation body is improved, and the service lives of the box-type substation and the electronic elements are prolonged.

Description

Low-noise outdoor high-low voltage prefabricated box type transformer substation

Technical Field

The utility model relates to the technical field of box-type substations, in particular to a low-noise outdoor high-low voltage prefabricated box-type substation.

Background

A box-type transformer substation, called prefabricated substation or prefabricated substation, is a high-voltage switch equipment, distribution transformer and low-voltage distribution equipment, and is a factory prefabricated indoor and outdoor compact distribution equipment which is integrated into one body according to a certain wiring scheme, i.e. the functions of transformer voltage reduction and low-voltage distribution are organically combined together, and mounted in a moisture-proof, rust-proof, dust-proof, rat-proof, fire-proof, anti-theft, heat-insulating, fully-closed and movable steel structure box, so that it is specially applicable to urban network construction and transformation, and is a brand-new transformer substation rising after civil transformer substation, and is applicable to mine, factory enterprise, oil-gas field and wind power station, and it can be substituted for original civil distribution house and distribution station, and can be formed into new-type complete transformation and distribution equipment, and for box-type transformer substations, and introduced and copied from France, Germany and other countries in the later 70 th century in China, structurally, a high-voltage switch cabinet and a low-voltage switch cabinet are adopted, a transformer is formed, the box transformer is called as an European box transformer, the appearance is compared with that of a house for the high-voltage switch cabinet and the low-voltage switch cabinet and the transformer are covered, the existing low-noise outdoor high-low voltage prefabricated box type transformer substation is easy to cause overhigh temperature of the box type transformer substation due to poor heat dissipation effect of the box type transformer substation and cause internal fire hazard to cause accidents, in the using process of the box type transformer substation, due to poor waterproof performance, rainwater cannot be discharged, water is easy to enter the box type transformer substation, normal operation and safety of the transformer substation are affected, the working efficiency of the box type transformer substation is reduced, the service life of electronic elements in the box type transformer substation is shortened, and therefore the low-noise outdoor high-low voltage prefabricated box type transformer substation is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a low-noise outdoor high-low voltage preassembled box type transformer substation to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a low-noise outdoor high-low voltage prefabricated box-type substation comprises a box-type substation body, wherein a sound insulation and absorption cotton layer is arranged on the side wall of an inner cavity of the box-type substation body, a low-pressure chamber is arranged on the left side of the inner cavity of the sound insulation and absorption cotton layer, a high-pressure chamber is arranged on the right side of the inner cavity of the sound insulation and absorption cotton layer, a substation chamber is arranged between the low-pressure chamber and the high-pressure chamber through a partition plate, through holes are formed in the side walls of the two groups of partition plates, axial flow fans are arranged on the left side and the right side of the top of the front side wall of the box-type substation body, air channels are fixedly connected to the output ends of the axial flow fans, an air inlet is fixedly connected to the two groups of air channels after the air channels penetrate through the top of the box-type substation body, a filter screen is arranged on the left side of the inner cavity of the air inlet, a first dust filter screen is arranged on the right side wall of the filter screen, and a top cover is arranged on the top of the box-type substation body, the top of the top cover is provided with a waterproof layer, the left side and the right side of the top cover are both provided with water chutes, the front side and the rear side of the top cover are both provided with water chutes which are fixedly connected with the water chutes, the bottom of the box-type substation body is provided with a mounting plate, the bottom of the mounting plate is movably assembled with a support base, the bottoms of the two groups of water chutes are both fixedly connected with water pipes, the bottoms of the water pipes are both fixedly connected with the left side and the right side of the top of the support base, the front side walls of the low-pressure chamber, the transformer chamber and the high-pressure chamber are all hinged with a box door through hinges, the top of the front side wall of the box door is provided with an observation window, the bottom of the front side wall of the box door is provided with heat dissipation holes, the bottom of the inner side wall of the box door is provided with second dustproof nets corresponding to the heat dissipation holes, and the tops and the bottoms of the second dustproof nets are both provided with sliding blocks, the inner side wall of the box door is provided with second chutes matched with the sliding blocks, the inner cavity of the low-pressure chamber is provided with a first mounting rack, the inner cavity of the transformer chamber is provided with first chutes on the side walls of the left side and the right side of the partition plate, the inner side of the first chute is assembled with a sliding plate in a sliding manner, the inner cavity of the high-pressure chamber is provided with a second mounting rack, the four corners of the inner cavity of the supporting base are provided with threaded rods, the four corners of the bottom of the mounting plate penetrate through the threaded rods and are assembled through the threaded nuts in a threaded manner, the bottom of the mounting plate is provided with an anticorrosive layer, the bottom of the mounting plate is movably provided with a fixed plate through supporting columns, the bottom of the inner cavity of the supporting base is provided with springs and is positioned between two groups of threaded rods, the tops of the springs are connected to the bottom of the fixed plate, and the left end and right end of the fixed plate are sleeved on the outer wall of the threaded rods, all be provided with the air outlet on the left and right sides lateral wall of box-type substation body bottom, it is two sets of the centre of air outlet inner chamber is equipped with the fan through support fixed, the right side wall of air outlet is provided with the absorber plate, the left side wall of absorber plate is provided with the fin, be provided with the second dust screen on the left side wall of air outlet, the right side wall of second dust screen is provided with first dust screen, the drainage hole has all been seted up to the left and right sides of support base bottom.

Preferably, the through holes are all formed in the height direction of the partition plate, holes matched with the air ducts are formed in the left side and the right side of the top of the box-type substation body, the sliding plate is matched with the first sliding groove in size, and the first sliding groove is assembled with the sliding plate in a sliding mode.

Preferably, the first mounting rack and the second mounting rack are arranged along the height direction of the low-pressure chamber and the high-pressure chamber, and the right sides of the front side walls of the three groups of the box doors are provided with handles.

Preferably, the four corners of the mounting plate and the fixing plate are provided with positioning holes matched with the threaded rods, and the four corners of the supporting base are provided with pipe holes matched with the water flowing pipes.

Preferably, the spring sets up along the length direction who supports the base, filter screen and first dust filter net all set up the inner chamber at the air intake.

Preferably, the second dust filter screen, the heat absorbing plate, the fan, the heat radiating fin and the first dust screen are fixedly assembled in an inner cavity of the air outlet.

Preferably, the size of the second dust screen is the same as that of the heat dissipation holes, the second sliding groove is formed along the length direction of the box door, and the second sliding groove is assembled with the sliding block in a sliding mode.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model has reasonable structural design, the waterproof layer is arranged at the top of the top cover, and the water guide grooves and the water retaining grooves are respectively arranged at the periphery of the top cover, so that rainwater flows into the water flowing pipe through the water guide grooves and is discharged through the drainage holes below the supporting base, a certain waterproof effect can be realized on the box-type substation body, the rainwater is prevented from entering the box-type substation body to damage electronic elements, the service life of the electronic elements is prolonged, when the box-type substation body works, a large amount of heat can be generated due to the work of the high-pressure chamber, the low-pressure chamber and the electronic elements in the substation chamber, and noise can be generated by a power converter in the substation chamber, the filter screen in the air inlet and the first dust filter screen can filter the air entering the outside by opening the axial flow fan, and then the air enters the box-type substation body to exchange heat through the matching of the heat dissipation holes, the high-pressure chamber, the transformer chamber and the low-pressure chamber can be quickly cooled, heat in the high-pressure chamber, the transformer chamber and the low-pressure chamber flows through the through holes on the two groups of partition plates, meanwhile, the fan in the air outlet is opened to work, the fan sucks heat generated in the box-type transformer substation body through the heat absorption plate, the heat is quickly radiated through the radiating fins, the radiating and cooling efficiency of the box-type transformer station is improved, meanwhile, the second dust filter net and the first dust filter net can effectively prevent mosquitoes and dust from entering, the operation safety of the box-type transformer station is improved, noise generated in the box-type transformer station body can be blocked through the sound insulation and absorption cotton layer, the working efficiency of the box-type transformer station is improved, the bottom of the mounting plate penetrates through the threaded rod to be sleeved and assembled in the inner cavity of the supporting base, the mounting plate is assembled through the threaded rod and the nut in a threaded manner, and the spring at the bottom of the fixing plate is used for fixing the box-type transformer station, make box-type substation body can play the cushioning effect when the installation pushes down, can realize that box-type substation body plays the shockproof effect of antidetonation, improves box-type substation body's stability, sets up the anticorrosive coating through the bottom of mounting panel and can play certain dampproofing anticorrosive effect to box-type substation body's bottom, improves box-type substation's life.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a schematic cross-sectional view of a support base according to the present invention;

FIG. 4 is a schematic sectional view of the air inlet according to the present invention;

FIG. 5 is an enlarged schematic view of the structure at A of the present invention;

fig. 6 is a schematic cross-sectional view of the door of the present invention.

In the figure: 1. a box-type substation body; 2. a water chute; 3. a waterproof layer; 4. a top cover; 5. a water retaining groove; 6. an axial flow fan; 7. an air inlet; 8. an observation window; 9. a sound insulation and absorption cotton layer; 10. a box door; 11. a high pressure chamber; 12. a threaded rod; 13. a nut; 14. heat dissipation holes; 15. a transformer room; 16. a support base; 17. mounting a plate; 18. a water flow pipe; 19. a low pressure chamber; 20. a first mounting bracket; 21. an air duct; 22. a first chute; 23. a second mounting bracket; 24. a through hole; 25. a slide plate; 26. a partition plate; 27. an anticorrosive layer; 28. a drainage hole; 29. a fixing plate; 30. a spring; 31. a filter screen; 32. a first dust filter screen; 33. a second dust filter screen; 34. an air outlet; 35. a heat absorbing plate; 36. a fan; 37. a heat sink; 38. a first dust screen; 39. a second chute; 40. a second dust screen; 41. a slide block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the present invention provides a technical solution: a low-noise outdoor high-low voltage prefabricated box-type substation comprises a box-type substation body 1, wherein a sound insulation and absorption cotton layer 9 is arranged on the side wall of the inner cavity of the box-type substation body 1, a low-pressure chamber 19 is arranged on the left side of the inner cavity of the sound insulation and absorption cotton layer 9, a high-pressure chamber 11 is arranged on the right side of the inner cavity of the sound insulation and absorption cotton layer 9, a substation chamber 15 is arranged between the low-pressure chamber 19 and the high-pressure chamber 11 through a partition 26, through holes 24 are formed in the side walls of two groups of partitions 26, axial flow fans 6 are arranged on the left side and the right side of the top of the front side wall of the box-type substation body 1, air inlets 7 are fixedly connected to the output ends of the axial flow fans 6, filter screens 31 are arranged on the left side of the inner cavity of the air inlets 7, first dust filter screens 32 are arranged on the right side wall of the filter screens 31, and a top cover 4 is arranged on the top of the box-type substation body 1, the top of the top cover 4 is provided with a waterproof layer 3, the left side and the right side of the top cover 4 are both provided with water chutes 2, the front side and the back side of the top cover 4 are both provided with water retaining grooves 5, the water retaining grooves 5 are fixedly connected with the water chutes 2, the bottom of the box-type substation body 1 is provided with a mounting plate 17, the bottom of the mounting plate 17 is movably assembled with a support base 16, the bottoms of the two groups of water chutes 2 are both fixedly connected with a water flow pipe 18, the bottoms of the water flow pipes 18 are both fixedly connected with the left side and the right side of the top of the support base 16, the front side walls of the low-pressure chamber 19, the transformer chamber 15 and the high-pressure chamber 11 are all hinged with a box door 10 through hinges, the top of the front side wall of the box door 10 is provided with an observation window 8, the bottom of the front side wall of the box door 10 is provided with heat dissipation holes 14, the bottom of the inner side wall of the box door 10 is provided with a second dustproof net 40 corresponding to the heat dissipation holes 14, and the top and the bottom of the second dustproof net 40 are both provided with sliders 41, the inner side wall of the box door 10 is provided with second sliding grooves 39 matched with the sliding blocks 41, the inner cavity of the low-pressure chamber 19 is provided with a first mounting frame 20, the inner cavity of the transformer chamber 15 is provided with first sliding grooves 22 on the left side wall and the right side wall of the partition 26, the inner side of each first sliding groove 22 is assembled with a sliding plate 25 in a sliding manner, the inner cavity of the high-pressure chamber 11 is provided with a second mounting frame 23, the four corners of the inner cavity of the supporting base 16 are provided with threaded rods 12, the four corners of the bottom of the mounting plate 17 penetrate through the threaded rods 12 and are assembled through the nuts 13 in a threaded manner, the bottom of the mounting plate 17 is provided with an anticorrosive layer 27, the bottom of the mounting plate 17 is movably provided with a fixing plate 29 through supporting columns, the bottom of the inner cavity of the supporting base 16 is provided with springs 30 and is positioned between the two groups of the threaded rods 12, the tops of the springs 30 are connected to the bottom of the fixing plate 29, the left end and the right end of the fixing plate 29 are assembled on the outer wall of the threaded rods 12 in a sleeved manner, all be provided with air outlet 34 on the left and right sides lateral wall of box-type substation body 1 bottom, the middle of two sets of air outlet 34 inner chambers is equipped with fan 36 through support fixed, the right side wall of air outlet 34 is provided with absorber plate 35, the left side wall of absorber plate 35 is provided with fin 37, be provided with second dust filter net 33 on the left side wall of air outlet 34, the right side wall of second dust filter net 33 is provided with first dust screen 38, drainage hole 28 has all been seted up to the left and right sides of support base 16 bottom.

Referring to fig. 2, the through holes 24 are all formed along the height direction of the partition 26, the left side and the right side of the top of the box-type substation body 1 are both formed with holes matched with the air duct 21, the size of the sliding plate 25 is matched with the size of the first sliding chute 22, and the first sliding chute 22 is assembled with the sliding plate 25 in a sliding manner, so that the height of the sliding plate 25 can be conveniently adjusted according to the height of the transformer;

referring to fig. 1 and 2, the first mounting rack 20 and the second mounting rack 23 are both arranged along the height direction of the low-pressure chamber 19 and the high-pressure chamber 11, and the right sides of the front side walls of the three groups of box doors 10 are both provided with handles, so that the maintenance or overhaul of the box-type substation is facilitated;

referring to fig. 3, the four corners of the mounting plate 17 and the fixing plate 29 are respectively provided with positioning holes adapted to the threaded rod 12, and the four corners of the supporting base 16 are respectively provided with pipe holes adapted to the water flow pipe 18;

referring to fig. 3 and 4, the spring 30 is disposed along the length direction of the supporting base 16, and the filter screen 31 and the first dust filter screen 32 are both disposed in the inner cavity of the air inlet 7;

referring to fig. 5, the second dust filter 33, the heat absorbing plate 35, the fan 36, the heat sink 37, and the first dust screen 38 are all fixedly mounted in the cavity of the air outlet 34;

referring to fig. 6, the size of the second dust screen 40 is the same as that of the heat dissipation holes 14, the second sliding slot 39 is disposed along the length direction of the box door 10, and the second sliding slot 39 and the slider 41 are slidably assembled.

The working principle is as follows: when the waterproof layer 3 is arranged on the top of the top cover 4, the water chute 2 and the water retaining groove 5 are respectively arranged on the periphery of the top cover 4, rainwater flows into the water flowing pipe 18 through the water chute 2 and is discharged through the drainage hole 28 below the supporting base 16, a certain waterproof effect can be achieved on the box-type substation body 1, rainwater is prevented from entering the box-type substation body 1 to damage electronic elements, the service life of the electronic elements is prolonged, the electronic elements can be conveniently installed through the first mounting frame 20 and the second mounting frame 23, the installation height of a transformer can be adjusted through the sliding assembly of the first sliding groove 22 and the sliding plate 25 in the transformer room 15, the practicability of the box-type substation body 1 is improved, when the box-type substation body 1 works, a large amount of heat can be generated due to the work of the electronic elements in the high-pressure chamber 11, the low-pressure chamber 19 and the transformer room 15, moreover, the transformer in the transformer substation chamber 15 generates noise, the filter screen 31 and the first dust filter screen 32 in the air inlet 7 filter air entering the outside by opening the axial flow fan 6, then the air enters the box-type transformer substation body 1 and exchanges heat with the heat in the box-type transformer substation body 1 through the cooperation of the heat dissipation holes 14, so that the high-pressure chamber 11, the transformer substation chamber 15 and the low-pressure chamber 19 can be rapidly cooled, the heat in the high-pressure chamber 11, the transformer substation chamber 15 and the low-pressure chamber 19 flows through the through holes 24 on the two groups of partition plates 26, meanwhile, the fan 36 in the air outlet 34 is opened to work, so that the fan 36 sucks the heat generated in the box-type transformer substation body 1 through the heat absorption plate 35, the heat is rapidly dissipated through the heat dissipation fins 37, the heat dissipation and cooling efficiency of the box-type transformer substation is improved, and meanwhile, the second dust filter screen 33 and the first dust filter screen 38 can effectively prevent mosquitoes and dust from entering, improve box-type substation's operational safety nature, inhale the cotton layer of sound 9 and can carry out the separation to the noise that produces in the box-type substation body 1 through giving sound insulation, improve box-type substation's work efficiency, the bottom through mounting panel 17 passes threaded rod 12 and cup joints the assembly at the inner chamber that supports base 16, through threaded rod 12 and the assembly of nut 13 spiro union, spring 30 through fixed plate 29 bottom, make box-type substation body 1 can play the cushioning effect when the installation pushes down, can realize that box-type substation body 1 plays the shockproof effect of antidetonation, improve box-type substation body 1's stability, it can play certain dampproofing anticorrosive effect to box-type substation body 1's bottom to set up anticorrosive coating 27 through mounting panel 17's bottom, improve box-type substation's life.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. Outdoor high low pressure prepackage type box-type substation of low noise, including box-type substation body (1), its characterized in that: the transformer substation is characterized in that a sound insulation and absorption cotton layer (9) is arranged on the side wall of the inner cavity of the box-type transformer substation body (1), a low-pressure chamber (19) is arranged on the left side of the inner cavity of the sound insulation and absorption cotton layer (9), a high-pressure chamber (11) is arranged on the right side of the inner cavity of the sound insulation and absorption cotton layer (9), transformer chambers (15) are arranged between the low-pressure chamber (19) and the high-pressure chamber (11) through partition plates (26), through holes (24) are formed in the side walls of the two groups of partition plates (26), axial flow fans (6) are arranged on the left side and the right side of the top of the front side wall of the box-type transformer substation body (1), air ducts (21) are fixedly connected to the output ends of the axial flow fans (6), air inlets (7) are fixedly connected to the two groups of air ducts (21) after the air ducts penetrate through the top of the box-type transformer substation body (1), and a filter screen (31) is arranged on the left side of the inner cavity of the air inlets (7), the dust filter is characterized in that a first dust filtering net (32) is arranged on the right side wall of the filter screen (31), a top cover (4) is arranged at the top of the box-type substation body (1), a waterproof layer (3) is arranged at the top of the top cover (4), water guide grooves (2) are arranged on the left side and the right side of the top cover (4), water retaining grooves (5) are arranged on the front side and the rear side of the top cover (4), the water retaining grooves (5) are fixedly connected with the water guide grooves (2), a mounting plate (17) is arranged at the bottom of the box-type substation body (1), a support base (16) is movably assembled at the bottom of the mounting plate (17), water flowing pipes (18) are fixedly connected to the bottoms of the two groups of water guide grooves (2), the bottoms of the water flowing pipes (18) are fixedly connected to the left side and the right side of the top of the support base (16), and box doors (10) are hinged to the front side walls of the low-pressure chamber (19), the transformer chamber (15) and the high-pressure chamber (11) through hinges, the top of the front side wall of the box door (10) is provided with an observation window (8), the bottom of the front side wall of the box door (10) is provided with heat dissipation holes (14), the bottom of the inner side wall of the box door (10) is provided with second dust screens (40) corresponding to the heat dissipation holes (14), the top and the bottom of each second dust screen (40) are provided with sliders (41), the inner side wall of the box door (10) is provided with second sliding grooves (39) matched with the sliders (41), the inner cavity of the low-pressure chamber (19) is provided with first mounting frames (20), the inner cavity of the transformer chamber (15) and the side walls on the left side and the right side of the partition plate (26) are provided with first sliding grooves (22), the inner side of each first sliding groove (22) is provided with a sliding plate (25) in a sliding manner, the inner cavity of the high-pressure chamber (11) is provided with second mounting frames (23), the four corners of the inner cavity of the support base (16) are provided with threaded rods (12), the bottom four corners department of mounting panel (17) passes threaded rod (12) and passes through nut (13) spiro union assembly, the bottom of mounting panel (17) is provided with anticorrosive coating (27), the bottom of mounting panel (17) is provided with fixed plate (29) through the support column activity, the bottom of supporting base (16) inner chamber all is provided with spring (30) and is located between two sets of threaded rod (12), the top of spring (30) all is connected in the bottom of fixed plate (29), the left and right sides both ends of fixed plate (29) all cup joint the assembly on the outer wall of threaded rod (12), all be provided with air outlet (34) on the left and right sides lateral wall of box-type substation body (1) bottom, the centre of two sets of air outlet (34) inner chamber is equipped with fan (36) through the support fixed, the right side wall of air outlet (34) is provided with heat absorption plate (35), the left side wall of the heat absorbing plate (35) is provided with radiating fins (37), the left side wall of the air outlet (34) is provided with a second dust filter net (33), the right side wall of the second dust filter net (33) is provided with a first dust screen (38), and the left side and the right side of the bottom of the supporting base (16) are provided with drainage holes (28).

2. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: through-hole (24) all are seted up along the direction of height of baffle (26), the hole with wind channel (21) looks adaptation is all seted up to the left and right sides at box-type substation body (1) top, the size looks adaptation of the size of slide (25) and first spout (22), first spout (22) and slide (25) sliding assembly.

3. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: the first mounting rack (20) and the second mounting rack (23) are arranged along the height directions of the low-pressure chamber (19) and the high-pressure chamber (11), and handles are arranged on the right sides of the front side walls of the three groups of the box doors (10).

4. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: the four corners of the mounting plate (17) and the fixing plate (29) are provided with positioning holes matched with the threaded rod (12), and the four corners of the supporting base (16) are provided with pipe holes matched with the water flowing pipe (18).

5. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: the spring (30) is arranged along the length direction of the supporting base (16), and the filter screen (31) and the first dust filter screen (32) are both arranged in the inner cavity of the air inlet (7).

6. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: the second dust filtering net (33), the heat absorbing plate (35), the fan (36), the radiating fin (37) and the first dust preventing net (38) are fixedly assembled in an inner cavity of the air outlet (34).

7. The low-noise outdoor high-low voltage preassembled box type substation of claim 1, characterized in that: the size of the second dust screen (40) is the same as that of the heat dissipation holes (14), the second sliding groove (39) is arranged along the length direction of the box door (10), and the second sliding groove (39) is assembled with the sliding block (41) in a sliding mode.

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